Lurbuk is an Orcbard found at the Moorside Inn in Morthal. Jonna claims that the only reason she hasn't booted him out is because there aren't any other customers for him to bother. A contract on him is offered in the Dark Brotherhood questline. He is called the worst bard in all of Skyrim, with Nazir noting that Astrid had to draw lots on which contract to answer because there were so many of them.

Lurbuk seems to talk in rhyming verses, in normal conversations with him.

If you speak to Lurbuk before killing him, you can ask him: "Sing me a song, bard. A song of fear, and death!" He will take your request at face value, and attempt to compose a suitable verse on the spot:

"Shadows creep, and... and phantoms leap! A man got... he got scared. And the demons dared! To um... visit upon him all which they feared!"

If you listen in on Lurbuk and Jonna before murdering him, you will hear the following conversation (among others):

Lurbuk: "Jonna, do you think the townspeople are warming to my serenades?"

Jonna: "No. They ain't. And they aren't gonna. If you weren't payin' for your room, I'd have thrown you out a long time ago."

Lurbuk: "Yes, but they'll come around eventually. You'll see."

Jonna: "Oh, I shouldn't be surprised if they come 'round. And if you're never seen or heard from agin [sic]."

Additionally, Jonna may greet you with: "I've tried to explain to Lurbuk that his "singin'" is gonna get his throat cut."

According to the game data, Lurbuk is the son of Chief Burguk of Dushnikh Yal. If Lurbuk is killed before the quest to do so, a letter is received from Burguk essentially thanking the player for killing Lurbuk.